Disable form autocompletion and submission

Resolve #1 and #2.

The form autocompletion gets in the way of usability since
suggestions and history do not add any value when searching
for npm package names.

The form submission causes a refresh, which negatively impacts UX.

index.html

@@ -23,7 +23,7 @@
         </a>
 
         <!-- Main -->
-        <form action="#">
+        <form action="#" autocomplete="off" onsubmit="return false;">
 
             <!-- Field -->
             <div class="mdl-textfield mdl-js-textfield display-4">